https://docs.aws.amazon.com/lexv2/latest/APIReference/API_runtime_StartConversation.html
StartConversation - Amazon Lex API Reference
Starts an HTTP/2 bidirectional event stream that enables you to send audio, text, or DTMF input in real time. After your application starts a conversation,...
amazon lex apireference
https://lists.whatwg.org/pipermail/commit-watchers-whatwg.org/2008/008929.html
[html5] r2043 - [] (0) Add a startConversation() method that wraps new MessageChannel and postMe...